BRIO Travel Explorer Set The Brio Travel Explorer Set is an ideal starter set for the Brio line of wooden train products as it features a simple set that includes 3 people, a rock tunnel, 16 pieces of track, 3 metro cars, a suitcase, a bench and a traffic signal. The metro cars have open-close roofs to easily insert the people and the traffic signal has a moveable arm to show the train when to go and when to stop.